Server crash

[zebany]

Server Crash Report
===================

Operating System: Microsoft Windows NT 5.1.2600.0
.NET Framework: 1.0.3705.0
Time: 21.06.2003 13:54:58
Mobiles: 22155
Items: 522802
Clients:
- Count: 154
....................
Exception:
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
at System.Collections.ArrayList.get_Item(Int32 index)
at Server.TypedEnumerator.MoveNext()
at Server.Effects.PlaySound(IPoint3D p, Map map, Int32 soundID)
at Server.Mobile.OnDeath(Container c)
at Server.Mobiles.PlayerMobile.OnDeath(Container c)
at Server.Mobile.Kill()
at Server.Mobile.Damage(Int32 amount, Mobile from)
at Server.Mobiles.PlayerMobile.Damage(Int32 amount, Mobile from)
at Server.AOS.Damage(Mobile m, Mobile from, Int32 damage, Int32 phys, Int32 fire, Int32 cold, Int32 pois, Int32 nrgy, Boolean keepAlive)
at Server.AOS.Damage(Mobile m, Mobile from, Int32 damage, Int32 phys, Int32 fire, Int32 cold, Int32 pois, Int32 nrgy)
at Server.Spells.SpellDamageTimerAOS.OnTick()
at Server.Timer.Slice()
at Server.Core.Main(String[] args)

It's not about a custom scipt. I haven't override anything about kill events.